Legend of Zelda: A Link to the Past Discussion
Anyway, If you're talking about the Evil Swamp (the second crystal in the dark world), you need to use the mirror close to the entrance and go to the light world. Enter as you normally would (move the stones) and then get to the room with 2 switches. Pull on the right one and the water will start flowing.
Go out again and return to the dark world. Now re-enter the doorway and you will be in the dark world but the water will be running and you can access that area.
I found the Blob thing at the end was quite easy to beat, but it sure took me a while to get to it
Hope this helps
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